Slightly different but I ran dual 5 3/4 lights on my old 750 GSXR sport touring conversion. It is awesome having that much light. I picked up a set of harley aftermarket lights and made mounts so one sits on each fork leg.
I personally wouldn't worry about duals and cars, the more light the better as far as being seen. You always have to drive defensively around cages especially left turning ones. It is really nice when a bulb dies at night and you still have another one. It really improves both long and short distance vision.
If you really want a sight throw in a set of 55/100w sky burners as we called them. You will probably also watch the charging/electrical system fry on the savage
but man will you see before it does! 8)
I am assuming you are planning those 4 1/2 as a replacement to your headlight and not an addition to. If so just watch the beam pattern. Some lenses that are made as running lights have a different pattern than headlights. I was also going to warn that many driving lights don't have low beams but it appears yours do. With that the case they probably have a decent beam patern.
If your electricals can handle it go for it!
If you want a picture of my set up let me know!